Equivalence of LP Relaxation and Max-Product for Weighted Matching in General Graphs

— Max-product belief propagation is a local, iterative algorithm to find the mode/MAP estimate of a probability distribution. While it has been successfully employed in a wide variety of applications, there are relatively few theoretical guarantees of convergence and correctness for general loopy graphs that may have many short cycles. Of these, even fewer provide exact “necessary and sufficient” characterizations. In this paper we investigate the problem of using max-product to find the maximum weight matching in an arbitrary graph with edge weights. This is done by first constructing a probability distribution whose mode corresponds to the optimal matching, and then running max-product. Weighted matching can also be posed as an integer program, for which there is an LP relaxation. This relaxation is not always tight. In this paper we show that 1) If the LP relaxation is tight, then max-product always converges, and that too to the correct answer. 2) If the LP relaxation is ...

• Type: Journal
• Year: 2007
• Where: CORR
• Authors: Sujay Sanghavi
• Keywords: CORR 2007, Education, LP Relaxation, Max-product Belief Propagation, Probability Distribution